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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Watchdog common code */
#include "common.h"
#include "panic.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "watchdog.h"
/* Panic data goes at the end of RAM. */
static struct panic_data * const pdata_ptr = PANIC_DATA_PTR;
void __keep watchdog_trace(uint32_t excep_lr, uint32_t excep_sp)
{
uint32_t psp;
uint32_t *stack;
asm("mrs %0, psp" : "=r"(psp));
if ((excep_lr & 0xf) == 1) {
/* we were already in exception context */
stack = (uint32_t *)excep_sp;
} else {
/* we were in task context */
stack = (uint32_t *)psp;
}
panic_set_reason(PANIC_SW_WATCHDOG, stack[6],
(excep_lr & 0xf) == 1 ? 0xff : task_get_current());
/* Copy task# to cm.hfsr[9:2]. */
pdata_ptr->cm.hfsr = HFSR_FLAG_WATCHDOG << 26
| (pdata_ptr->cm.regs[1] & 0xff) << 2;
/*
* Store LR in cm.regs[1] (ipsr). IPSR holds exception# but we don't
* need it because the reason (=PANIC_SW_WATCHDOG) is already stored
* in cm.regs[3] (r4). Note this overwrites task# in cm.regs[1] stored
* by panic_set_reason.
*/
pdata_ptr->cm.regs[1] = stack[5];
panic_printf("### WATCHDOG PC=%08x / LR=%08x / pSP=%08x ",
stack[6], stack[5], psp);
if ((excep_lr & 0xf) == 1)
panic_puts("(exc) ###\n");
else
panic_printf("(task %d) ###\n", task_get_current());
/* If we are blocked in a high priority IT handler, the following debug
* messages might not appear but they are useless in that situation. */
timer_print_info();
task_print_list();
}
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